He-Man.org
Massive site with information on the cartoon, action figures, Q&A forum, and an archive of newsletters.
www.he-man.org
Four Horsemen Studios
Site includes figure galleries, design art, and forums.
www.fourhorsemen.biz
History of He-Man
Tells the story of the show, with pictures.
flyingmoose.org/heman/heman.htm
MVCreations.com: Master of the Universe
From the makers of the comic, the site includes news, discussion forums, and gallery.
www.mvcreations.com/html/comic/motu/index.asp